I know, but if any RF will cause a problem and be picked up/heard through the audio, it's more likely to be when the AM/FM radio is being used.

I have heard noise when my phone was next to the computer but that was never a constant buzz.

Ever put your phone next to a CRT monitor or TV when a call comes in? The screen distortion is the reason I think all of the "there's absolutely no harmful radiation coming form cell phones" is BS. That much screen distortion needs a pretty strong magnetic field.